Articles written in Pramana – Journal of Physics

    • Decoherence of orthogonal coherent state in the amplitude damping model


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      By virtue of thermo-entangled state representation (TESR) and the technique of integration within an ordered product of operators, we solve the master equations of density operators in the amplitude damping model and examine firstly how the orthogonal coherent state (OCS) evolves in this model. The evolution formula of the field density operator is given. The effect of decoherence on the negativity of Wigner function (WF) is discussed. The results obtained by the numerical method are as follows: (1) its Wigner function displays negativity, which shows that unlike the coherent state, it has non-classical property and (2) the negativity of the Wigner function is gradually weakened, until it disappears with increased damping.

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